Video encoding apparatus and video encoding method

Abstract

According to one embodiment, a video encoding apparatus includes a motion vector calculation module, a motion boundary detection module, and a quantization parameter setting module. The motion vector calculation module calculates motion vectors for respective blocks in an input image. The motion boundary detection module detects a motion boundary between a motion region and a still region in the input image based on the motion vectors of the respective blocks. The quantization parameter setting module sets a value of a quantization parameter used to quantize a block that borders the detected motion boundary to a value smaller than a value which is set when the block does not border the motion boundary in accordance with a detection result of the motion boundary.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2008-305291, filed Nov. 28, 2008, the entire contents of which are incorporated herein by reference.BACKGROUND[0002]1. Field[0003]One embodiment of the invention relates to a video encoding apparatus and video encoding method.[0004]2. Description of the Related Art[0005]A video encoding technique required to transmit and store a video signal to have a smaller data size has been put into practical use, as represented by, e.g., the MPEG2 video standard.[0006]In the MPEG2 video standard, one image is divided into blocks each of 8×8 pixels, discrete cosine transformation (DCT) as one of orthogonal transformations is applied to respective blocks, and obtained DCT coefficients are quantized to attain variable-length encoding, thus compressing the image. Using motion-compensated prediction together, the encoding efficiency can be improved using...

AI Technical Summary

Problems solved by technology

However, since there is no correlation between the activities and predictive residuals, it is difficult for the adaptive quantization method based on activities to improve the image quality of a region with a large predictive residual.

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